<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item, index) of goods"  @click='selectMenu(index)' :key="index" class="menu-item" :class="{'current': currentIndex === index}" >
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="(item, index) of goods" :key="index" class="food-list foot-list-hook"  ref="foodList">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="(food, index) of item.foods" :key="index" class="food-item border-1px" @click="selectFood(food)">
              <div class="icon">
                <img :src="food.icon"  width="57" alt="">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">¥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">¥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-control :food='food'></cart-control>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shop-cart :selectFoods="selectFoods" :deliveryPrice="this.seller.deliveryPrice" :minPrice="this.seller.minPrice"></shop-cart>
    <food :food='selectedFood' ref="food"></food>
  </div>
</template>
<script>
import axios from 'axios'
import BScroll from 'better-scroll'
import ShopCart from '../../shopcart/ShopCart'
import CartControl from '../../cartcontrol/CartControl'
import Food from '../../food/Food'
export default {
  name: 'SellGoods',
  data () {
    return {
      goods: [],
      seller: {},
      classMap: ['decrease', 'discount', 'special', 'invoice', 'guarantee'],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  mounted () {
    axios.get('/api/data.json').then((res) => {
      this.goods = res.data.goods
      this.seller = res.data.seller
      this.$nextTick(() => {
        this._initScroll()
        this._calculateHeight()
      })
    }).catch((error) => {
      if (error) {
        console.log(error)
      }
    })
  },
  methods: {
    _initScroll () {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {click: true})
      this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {click: true, probeType: 3})
      this.foodsScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    _calculateHeight () {
      let foodList = this.$refs.foodList
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    },
    selectMenu (index) {
      let foodList = this.$refs.foodList
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    selectFood (food) {
      this.selectedFood = food
      this.$refs.food.show()
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  components: {
    ShopCart,
    CartControl,
    Food
  }
}
</script>
<style lang='stylus' scoped>
@import '../../../../../assets/styles/base.styl'
@import '../../../../../assets/styles/mixin.styl'
  .goods
    display: flex
    position: absolute
    overflow: hidden
    width: 100%
    top: 174px
    bottom: 46px
    border-top: 1px solid rgba(7, 17, 27, 0.1)
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        width: 56px
        height: 54px
        line-height: 14px
        padding: 0 12px
        &.current
          position: relative
          margin-top: -1px
          z-index: 10
          background: red
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          font-size: 12px
          display: table-cell
          width: 56px
          vertical-align: middle
        .border-1px
          border-bottom: 1px solid rgba(7, 17, 27, 0.1)
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        position: relative
        margin: 18px
        padding-bottom: 18px
        &:last-child
          border-none()
          margin-bottom: 0
          border: none
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 12px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            margin-bottom: 8px
          .count
            margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
      .border-1px
        border-bottom: 1px solid rgba(7, 17, 27, 0.1)

</style>
